Degenerate sterile neutrino dark matter in the cores of galaxies

Munyaneza, Faustin; Biermann, P. L.

doi:10.1051/0004-6361:20065710

Cited by 38 publications

(37 citation statements)

References 43 publications

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“…Third, in a speculation on the nature of the dark matter particle's, Munyaneza & Biermann (2006, following earlier work, suggested that a keV Fermion would naturally help to identify a mass scale from a degenerate configuration, and this mass for a dark matter particle is consistent with a few 10 6 M . This mass appears consistent with a) the low mass cutoff in the galaxy distribution found by Gilmore et al (2007), b) the early star formation (Biermann & Kusenko 2006;Stasielak et al 2007;Loewenstein et al 2009), and c) new galaxy data interpretation (de Vega & Sanchez 2009).…”

Section: The Transition In Massmentioning

confidence: 94%

“…To spin this out, one could imagine that black holes grow initially fast by feeding on dark matter (Munyaneza & Biermann 2006 and then continue to grow mostly by mergers; in this scheme, most of the black hole feeding would have come from dark matter. The gravitational waves emitted by all these growth events and mergers might obey the equation of state for dark energy (see Marochnik et al 2008).…”

Section: Extrapolation To Lower Masses?mentioning

confidence: 99%

“…There is a variety of explanations of why this is so (Portegies Zwart et al 2004;Munyaneza & Biermann 2006. It seems plausible to assume that the transition from massive black holes to nuclear star clusters holds a clue to solving this question.…”

Section: The Transition In Massmentioning

confidence: 99%

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The mass function of nearby black hole candidates

Caramete

Biermann

2010

A&A

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Context. The mass function of supermassive black holes in our cosmic neighborhood is required to understand the statistics of their activity and consequently the origin of ultra high energy particles. Aims. We determine a mass function of supermassive black hole candidates from the entire sky except for the Galactic plane. Methods. Using the 2MASS catalogue as a starting point, and the well-established correlation between black hole mass and the bulge of old population of stars, we derive a list of nearby black hole candidates within the redshift range z < 0.025, then perform an additional selection based on the Hubble type. We present our resulting catalogue elsewhere. The final list of black hole candidates above a mass of M BH > 3 × 10 6 M has 5829 entries. We perform a Hubble-type correction to account for selection effects, which reduces this number to 2919 black hole candidates. Here we use this catalogue to derive the black-hole mass function. We also correct for volume, so that this mass function is a volume-limited distribution to redshift 0.025. Results. The differential mass function of nearby black hole candidates is a curved function, with a straight simple power-law of index −3 above 10 8 M that becomes progressively flatter towards lower masses, turns off towards a gap below 3 × 10 6 M , and then extends into the range where nuclear star clusters replace black holes. The shape of this mass function can be explained in a simple merger picture. Integrating this mass function over the redshift range for which it has been derived, infers a total number of black holes with z < 0.025, and M BH > 10 7 M of about 2.4 × 10 4 , or, if we average uniformly, 0.6 for every square degree on the sky.

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Section: The Transition In Massmentioning

confidence: 94%

Section: Extrapolation To Lower Masses?mentioning

confidence: 99%

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The mass function of nearby black hole candidates

Caramete

Biermann

2010

A&A

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“…The experiments in the nineties using 63 Ni, 35 S and other nuclei yielded an upper bound ζ < 0.03 [20]. This bound is not restrictive for DM because the cosmological constraints based on the observed average DM density indicate for the currently popular models of DM sterile neutrinos a much lower bound, ζ < 10 −3 [6,7].…”

Section: Introductionmentioning

confidence: 97%

“…On the other hand, cosmological and astrophysical constraints such as the ones coming from the dark matter density and the galaxy phase space density, or alternatively, the universal galaxy surface density, lead to DM candidates in the keV mass scale, namely warm DM (WDM), refs. [1][2][3][4][5][6][7]. A keV mass scale sterile neutrino is the front running candidate for WDM.…”

Section: Introductionmentioning

confidence: 99%

Role of sterile neutrino warm dark matter in rhenium and tritium beta decays

Vega¹,

Moreno²,

Guerra³

et al. 2013

Nuclear Physics B

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Sterile neutrinos with mass in the range of one to a few keV are important as extensions of the Standard Model of particle physics and are serious dark matter (DM) candidates. This DM mass scale (warm DM) is in agreement with both cosmological and galactic observations. We study the role of a keV sterile neutrino through its mixing with a light active neutrino in Rhenium 187 and Tritium beta decays. We pinpoint the energy spectrum of the beta particle, 0 Te (Q β − ms), as the region where a sterile neutrino could be detected and where its mass ms could be measured. This energy region is at least 1 keV away from the region suitable to measure the mass of the light active neutrino, located near the endpoint Q β . The emission of a keV sterile neutrino in a beta decay could show up as a small kink in the spectrum of the emitted beta particle. With this in view, we perform a careful calculation of the Rhenium and Tritium beta spectra and estimate the size of this perturbation by means of the dimensionless ratio R of the sterile neutrino to the active neutrino contributions. We comment on the possibility of searching for sterile neutrino signatures in two experiments which are currently running at present, MARE and KATRIN, focused on the Rhenium 187 and Tritium beta decays respectively.

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A 4 flavor models in split seesaw mechanism

Adulpravitchai

Takahashi

2011

J. High Energ. Phys.

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A seesaw mechanism in an extra-dimension, known as the split seesaw mechanism, provides a natural way to realize a splitting mass spectrum of right-handed neutrinos. It leads to one keV sterile neutrino as a dark matter candidate and two heavy right-handed neutrinos being responsible for leptogenesis to explain the observed baryon asymmetry of the Universe. We study models based on A 4 flavor symmetry in the context of the split seesaw mechanism. It is pointed out that most of known A 4 flavor models with three right-handed neutrinos being A 4 triplet suffer from a degeneracy problem for the bulk mass terms, which disturbs the split mechanism for right-handed neutrino mass spectrum. Then we construct a new A 4 flavor model to work in the split seesaw mechanism. In the model, the experimentally observed neutrino masses and mixing angles can be realized from both type I+II seesaw contributions. The model predicts the µ − τ symmetry in the neutrino mass matrix at the leading order, resulting in the vanishing θ 13 and maximal θ 23 . The flavor symmetry A 4 is broken via the flavon vacuum alignment which can be obtained from the orbifold compactification. The model can be consistent with all data of neutrino oscillation experiments, cosmological discussions of dark matter abundance, leptogenesis, and recent astrophysical data. *

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Degenerate sterile neutrino dark matter in the cores of galaxies

Cited by 38 publications

References 43 publications

The mass function of nearby black hole candidates

The mass function of nearby black hole candidates

Role of sterile neutrino warm dark matter in rhenium and tritium beta decays

A 4 flavor models in split seesaw mechanism

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